CFESA Refrigeration Certification Test
latest update 2025/2026
1. The function of the compressor is : - correct answerB. to lower the pressure in the
evaporator so that the refrigerant temperature is lowered below the temperature of the
air in the box .
2 . Forced air evaporator coils are commonly used because : - correct answerA. they
absorb more heat in less time .
3 . Evaporator A operates with a 5 ° TD and evaporator B operates with a 15⁰ TD . -
correct answerD. Box A operates with higher humidity than box B
4 Whenever you re soldering refrigerant lines : - correct answerD. B & C
5 . R404A must be charged into a system : - correct answerA. In a liquid state
6 . If an evaporator fan motor needs to be replaced it must be replaced with : - correct
answerC. Any motor with the exact HP , speed , voltage , mounting and rotation
7 . The fan blade on an evaporator or condenser must be positioned in the housing or
shroud so that : - correct answerB. The blade is mounted mid way into the evaporator
housing opening or fan shroud opening on a condenser .
8. Which of the following refrigerants is an interim choice for a replacement for R - 12 in
a system that had a leak in the condenser and lost all of its refrigerant ? - correct
answerC. R - 409A
9 . Which refrigerant is an interim refrigerant choice for a R502 system that had a major
leak in the evaporator - correct answerd . R408A
10 . When evacuating a refrigeration system what tool is needed to ensure a good
evacuation and to help inform you if there is any moisture or leaks in the system : -
correct answerB. Micron gauge
11 . Which refrigerant would you convert a walk in freezer to if replacing the condensing
unit on an R502 system : - correct answerB. R404A
12 . Which phrase best describes the proper use for a refrigerated box using a cap tube
system ? - correct answerA. Storage freezer
, 13 . Which is the best example of the definition of a storage box ? - correct answerA. A
freezer on which the door is opened 8 times a day
14 . In order to maintain proper temperature under the various loads , a cooler or
freezer located on a front prep line must be equipped with : - correct answerC. A
thermal expansion valve
15 . A cap tube is ineffective on most commercial refrigeration systems because : -
correct answerD. it cannot respond to the refrigerant needs under heavy loads
16 . The sensor bulb on a TEV must be : - correct answerC. mounted tight to a clean
surface on the suction line close to the outlet of the coil
17 . An automatic expansion valve does not : - correct answerC. react well in situations
of heavy loads .
18 . For maximum efficiency the thermal expansion valve superheat for a freezer should
be about : - correct answerA. 5 degrees
19 . For maximum system efficiency the TEV superheat for a cooler should be about : -
correct answerC. 8-10 degrees
20 . What type of oil is most commonly used with CFC refrigerants ? - correct answerC.
Mineral
21 . What type of oil must be used with R404A ? - correct answerD. Polyolester
22 . What pressure relates to 20 ° F on R404A ? - correct answer56.7 psi
23 . What should be the maximum head pressure for a R404A system operating in a 85
° F ambient temperature ? - correct answer294 psi
24 . A system with R134A is operating at 146 psi head pressure . The temperature
measured four inches out of the condenser is 100 ° F . The ambient air temperature is
80 ° F . - correct answerD. the subcooling is 10 °
25 . A system operating with refrigerant R404A has a suction pressure of 29 psi . The
head pressure is 239 psi . The temperature on the line out of condenser is 85 degrees.
The temperature on the suction line at the outlet of the evaporator is 5 degrees . -
correct answerthe superheat is 10 degrees
26 . An R 404A cooler system using a cap tube system has a head pressure of 336 psi
and the line out of the condenser measures 95 degrees . Calculating the subcooling you
should see that : - correct answerthe system may be overcharged
latest update 2025/2026
1. The function of the compressor is : - correct answerB. to lower the pressure in the
evaporator so that the refrigerant temperature is lowered below the temperature of the
air in the box .
2 . Forced air evaporator coils are commonly used because : - correct answerA. they
absorb more heat in less time .
3 . Evaporator A operates with a 5 ° TD and evaporator B operates with a 15⁰ TD . -
correct answerD. Box A operates with higher humidity than box B
4 Whenever you re soldering refrigerant lines : - correct answerD. B & C
5 . R404A must be charged into a system : - correct answerA. In a liquid state
6 . If an evaporator fan motor needs to be replaced it must be replaced with : - correct
answerC. Any motor with the exact HP , speed , voltage , mounting and rotation
7 . The fan blade on an evaporator or condenser must be positioned in the housing or
shroud so that : - correct answerB. The blade is mounted mid way into the evaporator
housing opening or fan shroud opening on a condenser .
8. Which of the following refrigerants is an interim choice for a replacement for R - 12 in
a system that had a leak in the condenser and lost all of its refrigerant ? - correct
answerC. R - 409A
9 . Which refrigerant is an interim refrigerant choice for a R502 system that had a major
leak in the evaporator - correct answerd . R408A
10 . When evacuating a refrigeration system what tool is needed to ensure a good
evacuation and to help inform you if there is any moisture or leaks in the system : -
correct answerB. Micron gauge
11 . Which refrigerant would you convert a walk in freezer to if replacing the condensing
unit on an R502 system : - correct answerB. R404A
12 . Which phrase best describes the proper use for a refrigerated box using a cap tube
system ? - correct answerA. Storage freezer
, 13 . Which is the best example of the definition of a storage box ? - correct answerA. A
freezer on which the door is opened 8 times a day
14 . In order to maintain proper temperature under the various loads , a cooler or
freezer located on a front prep line must be equipped with : - correct answerC. A
thermal expansion valve
15 . A cap tube is ineffective on most commercial refrigeration systems because : -
correct answerD. it cannot respond to the refrigerant needs under heavy loads
16 . The sensor bulb on a TEV must be : - correct answerC. mounted tight to a clean
surface on the suction line close to the outlet of the coil
17 . An automatic expansion valve does not : - correct answerC. react well in situations
of heavy loads .
18 . For maximum efficiency the thermal expansion valve superheat for a freezer should
be about : - correct answerA. 5 degrees
19 . For maximum system efficiency the TEV superheat for a cooler should be about : -
correct answerC. 8-10 degrees
20 . What type of oil is most commonly used with CFC refrigerants ? - correct answerC.
Mineral
21 . What type of oil must be used with R404A ? - correct answerD. Polyolester
22 . What pressure relates to 20 ° F on R404A ? - correct answer56.7 psi
23 . What should be the maximum head pressure for a R404A system operating in a 85
° F ambient temperature ? - correct answer294 psi
24 . A system with R134A is operating at 146 psi head pressure . The temperature
measured four inches out of the condenser is 100 ° F . The ambient air temperature is
80 ° F . - correct answerD. the subcooling is 10 °
25 . A system operating with refrigerant R404A has a suction pressure of 29 psi . The
head pressure is 239 psi . The temperature on the line out of condenser is 85 degrees.
The temperature on the suction line at the outlet of the evaporator is 5 degrees . -
correct answerthe superheat is 10 degrees
26 . An R 404A cooler system using a cap tube system has a head pressure of 336 psi
and the line out of the condenser measures 95 degrees . Calculating the subcooling you
should see that : - correct answerthe system may be overcharged
